An apparatus for filling a plurality of containers with a fluid. The apparatus including a connector configured to removably couple the apparatus to a fluid source, a flow path providing fluid communication between the fluid source and a plurality of containers coupled to the apparatus, a sealing element disposed within each of the plurality of containers, the sealing element configured to couple the container to the apparatus and automatically seal the container when the container is decoupled from the apparatus, and a first retaining member and a second retaining member affixed to each of the plurality of containers to position the sealing element in a neck of each of the plurality of containers.

An example embodiment of an apparatus includes a housing with an opening at a first end and a plurality of holes at a second end, a plurality of hollow tubes attached to the plurality of holes, a plurality of containers removably attached to the hollow tubes, and a plurality of elastic fasteners, each elastic fastener clamping each container to a corresponding hollow tube, such that when the containers are filled with fluid and detached from the corresponding hollow tubes, each elastic fastener seals each container with the fluid inside.

A closure device (2) for closing a flexible container (4), in particular a valve bag (4), has a welding device (14), a sensor device (20) for acquiring a position of a part of the container (4) to be closed (6), and a control unit (28). The control unit (28) is coupled with the sensor device (20) and with the welding device (14), and is configured to place the welding device (14) in a first position and a second position spaced apart from the first position on the part of the container (4) to be closed (6) by actuating at least one moving device, to detect when at least one of the two positions has been reached via the sensor unit (20), and to actuate the welding device (14) at the respective first and second position to generate a weld seam on the container (4).

The present invention provides a packaging bag that can suppress the formation of an opening at a portion other than the vapor release seal portion. According to the present invention, provided is a packaging bag made of a film heat-sealed at a seal portion, wherein the seal portion includes a vapor release seal portion configured to form a vapor flow path as an internal pressure increases, the vapor release seal portion has a curved shape curved toward an inner direction of the packaging bag, the vapor release seal portion includes a first region including a distal end of the curved shape and a second region adjacent to the first region, and sealing strength in the first region is higher than sealing strength in the second region.